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I use styrofoam but it is laminated on both sides to be used as sign boards. Chickens will happily eat styrofoam so keep it out of reach. I had to duct tape edges and seams when I put mine up. My coops are all insulated with it and the walls of open coops are removable for summer weather.

Put some insulation under the roof. Metal roofing radiates a lot of heat below it.